<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title"
           @keyup.enter="addItem"/>
  </div>
</template>

<script>
  export default {
    props:{
      addTodo:Function
    },
    data(){
      return{
        title: ''
      }
    },
    methods:{
      addItem(){
        //1.检查输入的合法性
        const title = this.title.trim();
        if(!title){
          alert('必须输入内容。。。');
          return;
        }
        //2.根据输入，生成一个todo对象
        const todo ={
          title,
          complete:false
        }
        //3.添加到todos
        this.addTodo(todo);
        //4.清除输入
        this.title = "";

      }
    }
  }
</script>

<style scoped>
  /*header*/
  .todo-header input {
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 7px;
  }

  .todo-header input:focus {
    outline: none;
    border-color: rgba(82, 168, 236, 0.8);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
  }
</style>
